https://www.zerohedge.com/political/federal-government-gives-employers-green-light-incentivize-workers-get-vaccinated

K.16. Under the ADA, may an employer offer an incentive to employees to voluntarily provide documentation or other confirmation that they received a vaccination on their own from a pharmacy, public health department, or other health care provider in the community? (5/28/21)

Yes. Requesting documentation or other confirmation showing that an employee received a COVID-19 vaccination in the community is not a disability-related inquiry covered by the ADA. Therefore, an employer may offer an incentive to employees to voluntarily provide documentation or other confirmation of a vaccination received in the community. As noted elsewhere, the employer is required to keep vaccination information confidential pursuant to the ADA.

K.17. Under the ADA, may an employer offer an incentive to employees for voluntarily receiving a vaccination administered by the employer or its agent? (5/28/21)

Yes, if any incentive (which includes both rewards and penalties) is not so substantial as to be coercive. Because vaccinations require employees to answer pre-vaccination disability-related screening questions, a very large incentive could make employees feel pressured to disclose protected medical information. As explained in K.16., however, this incentive limitation does not apply if an employer offers an incentive to employees to voluntarily provide documentation or other confirmation that they received a COVID-19 vaccination on their own from a third-party provider that is not their employer or an agent of their employer.”